Device for finding dead-centers



No. 623,712. Patented Apr. 25, I899. J. J. GUSTAF.

DEVICE FOR FINDING DEAD CENTERS.

(Application filed July 2, 1898.)

(N0 Model.)

Unite stares JAMES J. GUSTAF, OF LOWTVILLE, MINNESOTA.

DEVICE FOR FINDING DEAD CENTERS.

SPECIFICATION forming part of Letters Patent No. 623,712, dated April 25, 1899.

Application filed J ly 2. 1898. SerialNo. 685,068. (No model.)

To all whmn it may concern:

Be it known that 1, JAMES J. GUSTAF, a citizen of the United States, residing at Lowville, in the county of Murray and State of Minnesota, have invented a new and useful Device for Finding Dead-Centers, of which the following is a specification.

This invention relates to devices for finding dead-centers; and the object thereof is to provide a simple and effective device to be used in connection with engines employing crank-disks for finding the dead-center and retaining the same until the eccentric is adjusted, thus enabling the engineer to quickly and accurately set the eccentric.

IVith the above object in View the invention consists of an extensible pointer carried by the end of the pitman and a similar pointer secured to the crank-pin, said pointers adapted when brought into coincidence to indicate the dead-center at one side and when pointing in reverse directions to indicate the other dead-center.

The invention consists in the details of construction hereinafter fully described in the specification, particularly pointed out in the claims, and illustrated by the accompanying drawings, in which Figure 1 is a side elevation of a crank-disk and portion of a pitman, showing my device in position and indicating one of the deadcenters. Fig. 2 is a similar view showing the device indicating the other dead-center. Fig. 3 is a top plan view of Fig. 1. Fig. lis a sectional view on the line 4 4 of Fig. 3. Fig. 5 is a perspective view of one of the pointercastings and extensible pointer. Fig. 6 is a similar View of the extensible pointer. Fig. 7 is also a perspective view illustrating. the other pointer-casting and extensible pointer. Fig. 8 is a perspective view of the extensible pointer for said casting.

Referring now more particularly to the accompanying drawings, A designates a crankdisk, B the crank-pin, and G the pitman, having a mark or groove D thereon adjacent to its connection with the crank-pin and indicating the center thereof. Secured to the connection-block E of said pitman is a casting F, the same having arms G, whlch engage opposite sides of said block and through which the clamping-screws H'pass, thus securing the casting in position. Said casting is formed with the slotted pointer extension I, and adjustable thereon is the extensible pointer .I, the same being slotted longitudinally at K to receive a screw-threaded stud carried by said extension, said stud being provided with a suitable clamping-nut. The casting is offset so that the extensible pointer is brought in close proximity to the end of the shaft L, upon which the disk is mounted, and said pointer carries an outwardly-projecting blade M, which projects through and moves in the slotted extension, the same extending to the outer surface of the pitman, so as to coact with the other pointer,to be described hereinafter. The casting for the other pointer consists of a frame N, adapted to inclose the crank-pin and having a swinging section 0, whereby it may be readily positioned upon said pin. Upon the inside of the frame are the teeth P, which engage the crank-pin and hold the casting firmly in position when the tightening-bolt Q is adjusted. This casting is also formed with a slotted pointer extension R, through which the screw S passes, the same engaging the extensible pointer '1, whereby the latter may be secured in the desired adjustment.

The operation of the device is as follows: IVhen the poiutercarried by the pitman points to the depression marking the center of the shaft upon which the disk is mounted and the other pointer is in line with themark D upon the pitman, the dead-center at one side is indicated. By revolving the crank-disk until said pointers come into coincidence, as illustrated in Fig. 2, the dead-center at the other side is ascertained. The pointers are made extensible in order to be used with crank-disks of various sizes.

From the above description it will be seen that I have produced a simple and effective device for readily and accurately ascertaining the dead-center, thus greatly facilitating the work of the engineer in setting the eccentric.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In an engine the combination with the crank-pin and pitman, of pointers carried by indicate the dead-center at the opposite side, substantially as described.

4. Inan engine, the combination with the pitman and crank-pin, of pointers carried by said pitman and pin, adaptedwhen pointing in reverse directions to indicate the deadcenter at one side, and when brought into coincidence to indicate the dead-center at the opposite side, substantially as set forth.

JAMES J. GUSTAF.

\Vitnesses:

KURT I. WELD, FLORA A. DAWSON. 

